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. 2017 Jun 28;8:430. doi: 10.3389/fphys.2017.00430

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Copyright © 2017 Ye, Li, Li, Chen and Ge.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The hormones and growth factors that may potentially regulate the development of Leydig cells. SLC, PLC, ILC, and ALC represent stem, progenitor, immature, and adult Leydig cells, respectively. ⊕, stimulation; θ, inhibition.